[turbofan] Don't spread global flag checks all over the compiler code.

src/compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler.h"
 
 #include <algorithm>
 
 #include "src/ast-numbering.h"
 #include "src/bootstrapper.h"
@@ skipping 99 matching lines @@
   // EnableDeoptimizationSupport), so it will replace the old code and all
   // its type feedback. To avoid this, always compile functions in the snapshot
   // with deoptimization support.
   if (isolate_->serializer_enabled()) EnableDeoptimizationSupport();
 
   if (isolate_->debug()->is_active()) MarkAsDebug();
   if (FLAG_context_specialization) MarkAsContextSpecializing();
   if (FLAG_turbo_builtin_inlining) MarkAsBuiltinInliningEnabled();
   if (FLAG_turbo_deoptimization) MarkAsDeoptimizationEnabled();
   if (FLAG_turbo_inlining) MarkAsInliningEnabled();
+  if (FLAG_turbo_source_positions) MarkAsSourcePositionsEnabled();
   if (FLAG_turbo_splitting) MarkAsSplittingEnabled();
   if (FLAG_turbo_types) MarkAsTypingEnabled();
 
   if (has_shared_info() && shared_info()->is_compiled()) {
     // We should initialize the CompilationInfo feedback vector from the
     // passed in shared info, rather than creating a new one.
     feedback_vector_ = Handle<TypeFeedbackVector>(
         shared_info()->feedback_vector(), parse_info->isolate());
   }
 }
@@ skipping 1414 matching lines @@
 }
 
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate(), zone()).PrintProgram(function()));
 }
 #endif
 } }  // namespace v8::internal